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The current Constitution of Poland was adopted on 2 April 1997. Formally known as the Constitution of the Republic of Poland (Polish: Konstytucja Rzeczypospolitej Polskiej), it replaced the temporary amendments put into place in 1992 designed to reverse the effects of Communism, establishing the nation as "a democratic state ruled by law and implementing the principles of social justice". It was adopted by the National Assembly of Poland on 2 April 1997, approved by a national referendum on 25 May 1997, and came into effect on 17 October 1997.

Poland has had numerous previous constitutional acts during its history. Historically, the most significant is probably the May Constitution adopted on 3 May 1791.

The attitude toward the past was articulated in the preamble, in which the citizens of Poland established a Republic "Recalling the best traditions of the First and the Second Republic, Obliged to bequeath to future generations all that is valuable from our over one thousand years' heritage ... Mindful of the bitter experiences of the times when fundamental freedoms and human rights were violated in our Homeland, ...".

Many articles were written explicitly to rectify the wrongs of previous governments. In response to communist-era collective farming, Article 23 established the family farm as the basis of the agricultural economy. Article 74 requires public officials to pursue ecologically sound public policy. Articles 39 and 40 prohibit the practices of forced medical experimentation, forbidding torture and corporal punishment, while Articles 50 and 59 acknowledge the inviolability of the home, the right to form trade unions, and to strike.

Those involved in drafting the document were not interested in creating a de facto Catholic Poland. That said, nods were given in the direction of the church, to the effect of protecting common morality. For example, in Article 18, marriage is granted the protection of the state, and in Article 53, freedom of religion, religious education, and religious upbringing are protected.

The preamble emphasizes freedom of religion or disbelief: "We, the Polish Nation - all citizens of the Republic, Both those who believe in God as the source of truth, justice, good and beauty, As well as those not sharing such faith but respecting those universal values as arising from other sources...". Article 25 provides further protection, that public officials "shall be impartial in matters of personal conviction, whether religious or philosophical, or in relation to outlooks on life, and shall ensure their freedom of expression within public life."

Other aspects include the affirmation of the political equality of man and woman in Article 32, and the affirmation of freedom of ethnic minorities to advance and develop their culture, in Article 35.

Which recovered, in 1989, the possibility of a sovereign and democratic determination of its fate,
We, the Polish Nation - all citizens of the Republic,
Both those who believe in God as the source of truth, justice, good and beauty,
As well as those not sharing such faith but respecting those universal values as arising from other sources,
Equal in rights and obligations towards the common good - Poland,
Beholden to our ancestors for their labors, their struggle for independence achieved at great sacrifice, for our culture rooted in the Christian heritage of the Nation and in universal human values,
Recalling the best traditions of the First and the Second Republic,
Obliged to bequeath to future generations all that is valuable from our over one thousand years' heritage,
Bound in community with our compatriots dispersed throughout the world,
Aware of the need for cooperation with all countries for the good of the Human Family,
Mindful of the bitter experiences of the times when fundamental freedoms and human rights were violated in our Homeland,
Desiring to guarantee the rights of the citizens for all time, and to ensure diligence and efficiency in the work of public bodies,
Recognizing our responsibility before God or our own consciences,
Hereby establish this Constitution of the Republic of Poland as the basic law for the State, based on respect for freedom and justice, cooperation between the public powers, social dialogue as well as on the principle of subsidiarity in the strengthening the powers of citizens and their communities.
We call upon all those who will apply this Constitution for the good of the Third Republic to do so paying respect to the inherent dignity of the person, his or her right to freedom, the obligation of solidarity with others, and respect for these principles as the unshakeable foundation of the Republic of Poland.

The first major privilege was granted in Košice by Louis Andegavin on September 17, 1374. In order to guarantee the Polish throne for his daughter Jadwiga, he agreed to abolish all but one tax the szlachta was required to pay. The Koszyce Privilege also forbade the king to grant official posts and major Polish castles to foreign knights, and obliged him to pay indemnities to nobles injured or taken captive during a war outside Polish borders.

In September and October 1454 Casimir IV granted the Cerkwica and Nieszawa Privileges which forbade the king to set new taxes, laws or draft nobles for war unless he had the consent of local diets (sejmiki). These privileges were demanded by the szlachta as a compensation for their participation in the Thirteen Years' War. As a compensation for the unsuccessful incursion on Moldavia which had decimated the szlachta, John Albert granted the Piotrków Privilege on April 26, 1496 which prohibited serfs from leaving their owners' land, and banned city dwellers from buying land.

In the spring of 1505 king Alexander signed a bill adopted by the Diet of Radom known as Nihil novi nisi commune consensu ("Nothing new without a common agreement"). The Nihil novi act transferred legislative power from the king to the Diet (Sejm), or Polish parliament. This date marked the beginning of the First Rzeczpospolita, the period of a szlachta-run "republic".

Until the death of Sigismund Augustus, the last king of the Jagiellonian dynasty, monarchs could only be elected from within the royal family. However, starting from 1573, practically any Polish noble or foreigner of royal blood could become a Polish-Lithuanian monarch. Every newly elected king was required sign two documents - the Pacta conventa ("agreed pacts") - a confirmation of the king's pre-election promises, and Henrican articles (artykuły henrykowskie, named after the first freely elected king, Henry of Valois). The latter document served as a virtual Polish constitution and contained the basic laws of the Commonwealth: